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U.S. NATIONAL MUSEUM BULLETIN 271 



Figure 3L — Synopiidae: a,b,c, variations of head, head very large, usually galeate, with 

 large downturned rostrum, except a few genera with head like fig. c; head like fig. c also 

 occurring in Astyridae [see Vitjazianidae, Eusiridae]; d, accessory flagella, absence prob- 

 ably erroneous, usually more than 3-articulate [see Eusiridae]; e, gnathopods feeble; 

 /, mandible, note short article 3 of palp (except in Bruuliopsis) [see Astyridae, Par- 

 daliscidae, Eusiridae]; g,h, telsons [see Astyridae, Oedicerotidaej. 

 Astyridae have a uniarticulate accessory flagellum, and widely spaced outer lobes of the 

 lower lip. Argissidae have a unique combination of shapes of coxae 1-4. Pardaliscidae have 

 very short coxae. Oedicerotidae have elongated fifth pereopods. Hyperlopsidae have bent 

 maxillary palps and elongated fourth articles of pereopods 1-2. Occasionally Astyridae and 

 Pardaliscidae have heads like figure h. Oculate synopiids have dorsally contiguous or co- 

 alesced eyes, occasionally with anteroventral accessory ommatidia. 



